|Nickname:||Anshin'in, The Non-Human Who Is Just Impartial|
Blood Type: AB
Najimi Ajimu is the founder of Hakoniwa Academy and the creator of the Flask Plan. Her partner is Hanten Shiranui. The leader of the Not Equals, Ajimu has been absent for three years after being sealed by Misogi Kumagawa. After Medaka Kurokami's success in reforming Kumagawa, the seal has weakened, whereupon Ajimu is set loose. Ajimu is the chief antagonist of the Kurokami Medaka's Successor Arc.Ajimu has a mysterious personality, speaking cryptically and explaining very little. Zenkichi Hitoyoshi does not recognize nor remember her; she claims that because her face was ripped off, she is nobody. She seems to care for Medaka, as she refers to her with a familiar tone, and tells Zenkichi not to make her cry anymore. Ajimu seems to exist in the hearts of both Zenkichi and Kumagawa. Each time Kumagawa dies, he encounters her in his heart before he can revive himself with his All Fiction. Because of this, he has come to regard her with extreme hatred. On the other hand she has a rather strong affection for Zenkichi, crying tears of joy upon meeting him at Hakoniwa Academy.
Most of the time Ajimu is laid-back as she is mostly seen smiling. But inside she has some dark traits similar to a regular Minus. She has a hate for people with "power" such as people with friends, skills, looks, and personality (she hates Shōnen manga because it shows off the people with power winning). Because of this, she fell for Kumagawa (who also shares the same view). Unlike Kumagawa however, she seems to have developed this personality due to how incredible her own abilities are, as opposed to the Minuses, who develop this mindset due to being failures at everything they try. In this vein, Ajimu labels herself as one of the Not Equals, as both Pluses and Minuses are the same in her eyes. Ajimu frequently breaks the fourth wall; she is aware that she is a character in a manga, knows how many volumes of the series have currently been released (thirteen at the time), and even knows that an anime adaption of Medaka Box is in production.
Voiced by: Nana Mizuki